PYTHON-4834 Add repr to IndexModel, SearchIndexModel #1003

Job	Run time
Build wheels for manylinux_x86_64	2m 15s
Make SDist	35s
Build wheels for manylinux_aarch64	10m 33s
Build wheels for manylinux_ppc64le	10m 0s
Build wheels for manylinux_s390x	10m 53s
Build wheels for manylinux_i686	2m 23s
Build wheels for win_amd6	4m 47s
Build wheels for win32	5m 39s
Build wheels for macos	4m 4s
Download Wheels	6s
	51m 15s

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